Indeformable bobbin for spinning artificial yarns



` A. BAzzoccHl INDE'FORMABLE BOBBIN FOR SPINNING ARTIFICIAL YARNS Filed Deo. 28, 1932 2 Sheets-Sheet 1 ALDO BAZzoccH/ Jan. 29, 1935. A. BAzzoccl-n 1,989,539

INDEFORMABLE vBOBBIN FOR SPINNING ARTIFICIAL YARNS Filed Dc. 28, 1932 2 Sheets-Sheet 2 ALDO BAZZoccHl mvENToR I" f 'Bygwzwmm ATTORNEYS Patented Jan. 29, 1935 UNITED f STATES PATENT oFFlcE INDEFORMABLE BOBBIN FOR SPINNING ARTIFICIALYARNS I Aldo azzpcchi, italy.

- 7 claims."4 (o1. is-s) When' spinning artificial yarnson the bobbin system, the bobbins constitute themembers on which the yarn is wound in normally wet condition.'

The bobbins are generally made of acid-proof metal, for instance aluminium, and have the shape of a cylinder with reinforced edges and with the walls perforated with thickly set holes of but a few millimeters diameter.

The yarn is wound in wet condition on the said bobbins and is then subjected, in wound condition, to a set of treatments intended to wash, desulfurate, bleach etc. the yarn. All such treatments are vwet treatments, so that the bobbins finally must be passed into hot air dryers Where the yarn is freed from the moisture and thus made ready for the following twisting, reeling, etc.

It is well known that, on drying, the artificial yarn, for instance regenerated viscose yarn, tends to shorten and thus it happens that, on'the conventional bobbins, the yarn layers adjacent to the body of the'bobbin cannot shorten because the bobbin is rigid, whereas the outer layers can shorten inasmuch as the underlying yarn-layers constitute a soft and compressible mass.

The diierence in the behavior of the inner and of the outer layers during the drying process is a cause of differences in the characteristics of the yarn itself, the latter diierences being a source of serious defects in Weaving. In order to avoid these defects, the yarn is generally made up in hanks and then wetted and dried again, in order that any portion of artificial yarn that has not 35 contracted freely during the drying of the bobbin may contract then and become uniform in its elongation and tenacity characteristics. Such a method is expensive inasmuch as it involves a greater number of operations and a greater number of machines, and impairs the quality of the yarn.

The subject matter of the present invention is and uniformly contract as well in the inner as' in the outer layers. In other words, if it is rst determined that on drying the contraction of the yarn is about 8%, the bobbin should be deformable as much as will suffice to allow its circumference to decrease by 81%.

lin this manner no Adifferences will exist in the characteristics of the inner and of the outer layers of the yarn and the weaving defects will therefore be avoided without resorting to further successive operations.

'Ihe accompanying drawings illustrate two embodiments of the deformable bobbin according to the invention merely by way of example, it being understood that the examples do not at all limit the scope of the invention. f

In the drawings:

Fig. 1 is a longitudinal section showing the rst 15- type of deformable bobbin.

Fig. 2 shows the same bobbin in cross section.

Fig. 3 is a longitudinal section showing the second type of deformable bobbin.

Fig. 4 shows the bobbinaccording cross section.

The bobbin according ,to Figs. 1 and 2 is longitudinally divided into three sections 1--2-3. Section 1 is connected to section 3 by the hinges 4.

Section 2 is connected to section 3 lby the hinges 5.

Sections r3 and 1 are secured to one another by means of the elongated rings 6 which engage the hooks 8. 'I'he said rings are actuated by the levers 7 pivoting about in the hinges 5. 1

yWhen the rings 6 are engaged in the hooks 8, the complex built up of the three bobbin sections is. rigid, since it is constituted by a hinged triangle. Under these denitely restricted conditions the bobbin will receive the yarn 9 and the 35 ends of body of the wound yarn will rest on two elastic bands 10, 10, preferably of india rubber, provided at the bobbin ends, these bands having, the purpose of preventing the liquid from passing through the discontinuities or gaps resulting at the edges which are not covered by the yarn, when, during the moistening, the vacuum system is used.

Afterfcompletion of the winding and subse- 45 quent wet-treatments of the yarn, the levers 7 should be raised before thebobbin is laid in the drying room. This will disengage the rings 6 from the hooks 8, and the section 2 which was formerly held between the edges of sections 1 and 3 by a portion of the ring 6 and by a hinge 11 pivoting at 5, will be allowed to tilt inwardly and thus permit the sections 1 and 3, which are hingedtogether, to move towards each other.

Y The bobbin will thus take up an ovalform, the

to Fig. 3 in 20 perimeter of which is smaller than ther'loriginal circumference by the amount of the width of section 2 which has tilted inwardly.

The said amount is determined by the shortening which the yarn experiences in drying.

In practice it 'has also been found that the bobbin may be made also in two sections only, the hooking system being thus simplified and rendered more practical. The object of allowing the bobbin to decrease in circumference under the stress of the yarn as it contracts in drying, is reached in any case inasmuch as the bobbin, owing to its cylindrical shape, is sufficiently yelastic since, under a minimum portion of; the contraction stress of the yarn, the two edges which.

prior to the drying opposed themselves to thevtiltable gate being opened, approaclrone; anotherl till they come into contact When, duringthe drying process, the said gate has been lowered in, advance. Referring howto-Figs. 3 and 4, the bobbinis longitudinally divided into two sections 1 and 2 connected vto each other by the hinges 8. The.

ythese rigid conditions the bobbin receives the yarn 6, and the ends of the `body Aof the, woundV yarn rest on the marginal elastic bands or sheaths 10 provided at the ends of the section l, these bands i having the purpose of preventingl the liquids from passing through the'gapsA or fissures resulting at the `edges which are not covered by the yarn, when, during the moistening, the vacuum system is used.` Y

,On completion of the winding and ofthe following wet-treatments of the yarn, prior to laying the bobbin in the drying room of the' two handle-shaped extensions '4' are pushed inwardly, thereby releasing the section 1 from'sectionA 2. Underthe contraction Ystress exerted'byl the yarn in drying,the `oppositeedges of section 2 will move nearer due to the elasticity of the bobbin and the bobbin will take an oval form, the perimeter of which will be smaller than the' original eXtreme circumference by an-Y arnountequal` to section 1 width that has been tilted inwardly.

This width'l of the sectionyl is determinedv by the amount of shortening undergone by the yarn in drying, Y e

Having now particularly described and ascertained the nature of my said invention and in vwhat` manner the same is to be performed, I declare that what I claim iszl. A bobbin for Winding artificial yarn thereupon, comprising the combination of arcuate members provided withv hinge means intercon-` pair of "abuttingv ends beingseparable and onev of said members being outwardlyswing'able upon thehinge means into an extreme operative posi` tion wherein said members together form 1an annular rigid bobbin body for wet treatment of the yarn, 'and which onefswingable lmember is also swingable inwardly from said operative position passing through the fissuresin the operation position of said bobbin members.

2. A bobbin for winding artificial yarn thereupon, comprising the combination of arcuate vand perforate plate members provided with hinge means interconnecting two abutting ends thereof, at least one pair of abutting ends being separable andv one of said members being` outwardly swingable upon the hinge means into an extreme operative position wherein said members together vform an annular rigid bobbin body for wet treatment of the yarn, which one swingable member is also swingable inwardly from saidy operative position; so as to leave a gap in the periphery of the bobbin bodyand allow partial collapse thereof to at least the extent corresponding to the shrinkageoftheyarnl during drying treatment thereof,

and a pairof flexible annular end sheaths dis,-V

posed on the end margins of the bobbin body and serving'as shields covering the exposed perforated areas andthe fissurescorresponding to the-connection'sin the gap between the members of said body beyond the yarn .windings in order to prevent any liquid from passing idly through said exposed perforated areas and the fissures during wet treatment of "the yarn under pressure or vacuum. Y

3. A deformable `bobbin according to claim 1, wherein the 'hinge means are disposed upon the bobbin, members solely within the annular outline thereof in order'to-avoidprojections 'and obstructions on said bobbin beyon'dsaid outline andl also to cause the swingable member to remain within said outline in all' positions andbe swingable solely inward from and outward to the same outline into extreme positions.

4. A :deformable bobbin according to claim l", whereinthe bobbin has 'two arcuate members aside from the swingable arcuate member, which twofmembers are provided with intermediate hinge means connectingy .they two .abutting ends of same together so thatA whensaid swingable member-isv swung inwardl intocollapsed. position,v said two members maybe collapsed toa limited extent tending to close the gap between them normally occupied by theswingable member when in operative position,` while the yarn andthe coveringmeans for the fissures remain in situ-in collapsed positionsl of said. members.

5. Adeformablebobbin according to claiml, wherein the swingable `bobbin member ,is limited to swing solely inward from and outward tothe normal. annular outline of the bobbin,V and the othermember is inherently deformable to a limited extent tending thus to bring th'efends thereof together and close the gap normally occupied by the swingable member when in operative position, in order to decrease the perimeter of the bobbin at will, while the yarn and the covering means for the ssures remain in situ in collapsed positions-of said members.

6. A, deformable bobbin according to claim 2', which Ais provided with-locking means hingedto at least oneA of the arcuate 4bobbin members 'within the annularfoutline'of the bobbin body for locking the bobbin members together to form a'rigid unit in assembled operative condition.

'7; A deformable bobbin according to claim 2, which is provided with locking means directly bridging the gap occupied by the swingable member, hinged to one ofthe arcuate bobbin members and disposed beneaththe latter and locking the bobbin members togetherto form a rigid' unit in operative assembled 'position thereof# y f ALD@4 BAZZOCCHIL 

